Quote:
Originally Posted by GeoffScratcher
......I rotated the waterblock 90 degrees so that my in is at the bottom and the out is at the top (try and create a bit of extra resistance).
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P.S will rotating the cpu block in the way described above potentially eff things up at all?? 
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Nope. You could have the pump in the garage and the pc at the 3rd floor, there would be no extra stress on the pump.
This is because the height difference stresses the pump in an open loop only, in a closed loop what comes up must also come down, effectively creating exactly the same positive pressure at the pump's inlet that the liquid going up creates at the outlet.
If you want resistance, kink a pipe or something like that... But wait, that sounds like a bad thing to do right?

That's why you shouldn't do it. And it won't help, BTW.